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  • Jul 29 20:06
    j9brown commented #141
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  • Mar 01 04:16
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  • Jul 20 2021 18:55
    orgicus commented #132
Jamie Meredith
@jlmeredith
They are sold mainly as kits
J. Grizzard
@elfchief
That's pretty nice looking.
Jamie Meredith
@jlmeredith
let me find the video where I learned about this
Guy that did dubstep christmas lights show
He has an amazing series of videos that explains every aspect of how all of this was built
well worth the watch - little dry but great video quality and great step by step instructions
I started investigating the 2801 pixels after I saw this and the controller that he is using
propeller CPU
opps
need to google that one @scanlime - I have not heard of it
Jamie Meredith
@jlmeredith
This is a short clip of the display about 8 days ago - I have since addressed a lot of the bad strips you see in the video and should have something more substantial to show in the next day or so
Jamie Meredith
@jlmeredith
Excellent resource on understanding the WS2812B LED - https://www.youtube.com/watch?v=EXr2_zSfnFw
Jamie Meredith
@jlmeredith
Question - Has anyone had luck finding a three wire quick connector for WS2811/12 strips? I see four wire connectors everywhere, but no three wire connectors
J. Grizzard
@elfchief
Jamie Meredith
@jlmeredith
@elfchief - No - like this - http://amzn.to/1Sucls5
Matthew Kessler
@M-I-Kessler
maybe those will help
3 pin jst sm
Daniel Garcia
@focalintent
No - the thing he's talking about are solder less clips that snap onto the ends of the strip.
J. Grizzard
@elfchief
I didn't even know those existed. But now I want them. In 3-pin flavor. Heh.
Jamie Meredith
@jlmeredith
@elfchief - I am thinking about getting some of the 4 pin versions and seeing if they will work
J. Grizzard
@elfchief
I'd think the spacing would be different. :(
Jamie Meredith
@jlmeredith
I have had nothing but problems trying to solder strips - I have found that putting a heat sink between the solder point and the led works most of the time to move the heat away from the LED
Daniel Garcia
@focalintent
Let me save you some time - the spacing is different
J. Grizzard
@elfchief
Wonder what you're doing different from me. I soldered a dozen strips last month with no special precautions and got a 0% failure rate.
Jamie Meredith
@jlmeredith
@elfchief - what temp do you solder at?
I pre-tin the contact points and then touch attach pre-tinned wires - I have never had issues with soldering most components - these have been tough - both the ones from Adafruit and the general ws2812 ones from Amazon
J. Grizzard
@elfchief
Y'know, I totally don't remember what temp I had it set to. But I can find out!
this is what I have been doing to avoid the overheating issue - I have been running the soldering iron at around 450
@focalintent - curious how you determined the spacing? Have you tried something like this?
J. Grizzard
@elfchief
Looks like... 370C. Also using leaded solder, which probably makes things go quicker.
Daniel Garcia
@focalintent
Yes - and the 4 wire clips don't line up on three wire strips.
Jamie Meredith
@jlmeredith
@elfchief - are you sure you did not mean 370F? That would be nearly 700F!
J. Grizzard
@elfchief
I'm sure! Given the lack of thermal mass that's probably a bit on the high side... probably like 340C would be better. But I'd rather have slightly too high than too low.
The quicker you can get in and out (within reason) the less time there is for heat to wander away from the joint and to your components. It takes me probably 2 seconds tops to solder a wire to one of the LED strips.
Micah Elizabeth Scott
@scanlime
I'll second the technique where you pre-tin both sides, then in one step merge the two to form the joint. It'll give you a strong joint if you're sure to hold the wires still while it cools, and if you're sure the heat penetrated both joints and there's still enough residual flux. Still takes some time though, and it'd be nice to have other options :)
J. Grizzard
@elfchief
Yeah, definitely pre-tin everything. Down the not-tinning path lays madness.
Brandon Stafford
@pingswept
Has anyone worked on making Fadecandy work with the dotstar LEDs? The faster update rate is attractive. I realize it would require 2 pins per strip, but it seems like the hardware would work.
Micah Elizabeth Scott
@scanlime
I haven't done any work towards that end myself, since the dotstar LEDs are already so easy to hook up to so many different platforms. I know something like the Fc would still have a bit of a niche, but I've been trying to use my time to work on something a bit broader
If you're using the Raspberry Pi, I think there are some easy options out there for driving SPI leds like the dotstar directly from the GPIO pins, and you can even keep compatibility with OPC and use the Fadecandy examples and libraries if you like
hope that helps!
Brandon Stafford
@pingswept
Thanks for the info, @scanlime!
Is there a problem with timing when using SPI on a RPi? I would expect that if you were trying to do smooth transitions from one color to another, the OS scheduler would ruin the timing. Like, you get an HTTP request, and the next 10 ms are spent dealing with it, so the SPI data stutters a little. I'm sure all the data would still arrive, but not evenly spaced.
Micah Elizabeth Scott
@scanlime
@pingswept That will be true to some extent I suspect; not sure how much DMA the usual SPI drivers use. I'd be really surprised if you see delays as bad as 10ms though, it'll probably be imperceptible unless the rPI is heavily loaded
Jamie Meredith
@jlmeredith
I am curious if anyone here has thoughts on the best flavor of linux to use with Processing? I try to run a sketch on my RPi2 but had issues with the video drivers not working (sketch uses video) - I suspect it was a bit too processor intensive so I am moving up to a small form factor computer instead. I would like to avoid windows if possible, but will use it if others here think it is a better option than Linux
Jamie Meredith
@jlmeredith
Hey there @scanlime - I am having a terrible time getting video to play through processing on a headless Unbuntu computer - wondering if you have suggestions for otherways to drive video to a large display (2048 pixels with 4 fadecandies) - I am successfully driving it via a mac but have had no luck with Rpi2 or an i5 Ubuntu box - my next step will be to install windows and try to make it happen but that just kind of gives me the willies to even think about.